Coreopsis, also called tickseed, is a bright and cheerful flower that’s easy to grow and very tough. It can grow well in many types of gardens and doesn’t need much care, which makes it great for both new and experienced gardeners.
Coreopsis adds lots of color, attracts bees and butterflies, and blooms for a long time. This guide will help you learn how to grow and care for coreopsis so you can enjoy its beautiful flowers all season.
What is Coreopsis?
Coreopsis is a group of flowering plants in the daisy family (Asteraceae). These plants come from North America and are known for their happy, daisy-like flowers. There are many types of coreopsis, but the most common ones are Coreopsis tinctoria and Coreopsis grandiflora. They are popular because of their bright colors and long-lasting blooms.
Why grow Coreopsis?
- Long-lasting blooms: Flowers from early summer until frost.
- Low maintenance: Tolerates poor soil and drought once established.
- Wildlife friendly: Attracts bees, butterflies, and birds.
- Versatile: Great for borders, wildflower meadows, containers, and cutting gardens.
How to Grow Coreopsis
1. Selecting the Right Variety
Coreopsis comes in both annual and perennial forms, with colors ranging from classic yellow to pink, red, and bicolors. Popular species include:
- Coreopsis grandiflora (large, golden blooms)
- Coreopsis verticillata (fine, thread-like foliage)
- Newer cultivars with unique colors and compact habits.
2. Planting Location
Sunlight: Full sun is essential—at least 6 to 8 hours per day. Plants grown in less light become leggy and produce fewer flowers.
Soil: Well-drained, sandy or loamy soil is ideal. Coreopsis tolerates poor soil but dislikes wet, heavy clay. Amend clay soils with compost to improve drainage.
Spacing: Space plants 12–18 inches apart to ensure good air circulation and prevent disease.
3. Planting Steps
From Seed: Start seeds indoors 6–8 weeks before the last frost, or direct sow after frost danger has passed. Cover lightly with soil and keep moist until germination (1–3 weeks).
From Plants: Plant nursery-grown seedlings or bare roots in spring after frost. Dig a hole twice as wide as the root ball, set the plant at soil level, backfill, and water thoroughly.
Coreopsis Care Tips
Watering
- Water regularly during the first growing season to establish roots.
- Once established, coreopsis is drought tolerant and only needs water during prolonged dry spells. Overwatering can lead to root rot.
Fertilizing
Fertilizer is rarely needed. Too much fertilizer, especially nitrogen, encourages leaf growth at the expense of flowers. If soil is poor, add compost in spring.
Deadheading and Pruning
- Remove spent blooms (deadhead) regularly to encourage continuous flowering and prevent unwanted self-seeding.
- For large plantings, shear back by half after the first flush of blooms to promote reblooming and tidy growth.
Staking
Tall varieties may need staking to prevent flopping, especially in windy areas.
Dividing and Propagation
- Divide perennial coreopsis every 2–3 years in early spring or fall to rejuvenate plants and prevent overcrowding.
- Propagate by seed, division, or basal cuttings.
Growing in Containers
- Use pots at least 8–10 inches deep with good drainage.
- Container-grown plants dry out faster and need more frequent watering.
Seasonal Care
Overwintering
- Most perennial coreopsis are hardy in USDA zones 4–9.
- In late fall, cut stems to ground level and mulch with 2–3 inches of organic material to protect roots. Remove mulch in spring.
Common Problems and Solutions
Pests: Generally pest-free, but watch for aphids, slugs, and snails, especially on young plants. Remove by hand or use organic controls.
Diseases: May develop powdery mildew or fungal issues in humid conditions. Ensure good air circulation and avoid overhead watering.
Poor Bloom: Usually due to insufficient sunlight or over-fertilization. Move to a sunnier spot or reduce feeding.
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Attracting Pollinators and Wildlife
Coreopsis is a magnet for bees, butterflies, and birds. Leave some seed heads in fall to provide food for birds through winter.
Frequently Asked Questions (FAQs)
Q: How often should I water coreopsis?
A: Water regularly during establishment. Once mature, water only during extended dry periods. Container plants need more frequent watering.
Q: Should I fertilize my coreopsis?
A: Fertilizer is usually unnecessary. If your soil is very poor, add compost in spring. Avoid high-nitrogen fertilizers.
Q: How do I keep coreopsis blooming all season?
A: Deadhead spent flowers or shear the plant back by half after the first bloom flush. This encourages new buds and prolongs flowering.
Q: Can coreopsis grow in pots?
A: Yes, choose a pot with good drainage and water more often than in-ground plants. Use a gritty, well-draining potting mix.
Q: When and how should I divide coreopsis?
A: Divide every 2–3 years in early spring or fall. Dig up the clump, separate into sections, and replant.
Q: Are coreopsis deer resistant?
A: Yes, deer generally avoid coreopsis, making it a good choice for gardens with browsing wildlife.
Q: Why are my coreopsis plants not flowering?
A: The most common reasons are too little sunlight, over-fertilization, or overcrowding. Ensure at least 6 hours of sun, avoid excess fertilizer, and divide if needed.
Conclusion
Coreopsis is a bright, strong, and easy-to-care-for plant that fits well in any garden. As long as you give it enough sunlight, good soil, and remove old flowers (deadheading), it will bloom for many months.
You can grow coreopsis in garden beds, wildflower areas, or pots. No matter where you plant it, coreopsis will add long-lasting color and attract bees and butterflies to your garden.